Last week I upgraded our office server from v8.7.6 to 8.8.8 as part of our plans to make the server PCI compliant. I also followed some guides to harden the server. At some point, the web interface stopped working.

I can get the login page, I can enter my login details and once I click 'log in' nothing happens, it just sits there 'waiting for server'. I have searched the nginx logs but they show nothing out of the ordinary. I have compared to the config files to my home installation (which I upgraded before hand as a test) and nothing is different. I'm at a loss.

I must point out, that I CAN log in via port 8443, so I believe it is a proxy side of things.

Can anyone point me in the right direction on where to look or how to fix this? I can provide logs etc if needed.